System and methods for transmitting data

• US 7,042,933 B2
• Filed: 05/21/2004
• Issued: 05/09/2006
• Est. Priority Date: 06/28/1999
• Status: Expired due to Term

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Quackenbush, Schuyler Reynier, Snyder, James H, Kretschmer, Mathias R., Driessen, Peter Frank
• Primary Examiner(s): Vanderpuye, Kenneth
• Assistant Examiner(s): Nguyen, Dung X.
• Application Number:
  US10/851,581
• Publication Number:
  US 20050010850A1
• Time in Patent Office: 718 Days
• Field of Search: 375/219, 375/295, 375/296, 714/758
• US Class Current: 375/219
• CPC Class Codes: G06F 11/10 Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
• CPC Class Codes: H03M 13/356 Unequal error protection [UEP]
• CPC Class Codes: H03M 13/6508 Flexibility, adaptability, parametrability and configurability of the implementation
• CPC Class Codes: H04L 1/0017 where the mode-switching is based on Quality of Service requirement
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/1829 Arrangements specially adapted for the receiver end
• CPC Class Codes: H04L 2001/0098 Unequal error protection

Abstract

A system and method for transmitting data over a channel, in which the data are categorized in at least two different categories. For example, the data are categorized according to the effect on perceived degradation on the data when error mitigation is performed on the data. Corrupted data of the first category are replaced using a first replacement method, such as retransmission and forward error correction. The corrupted data of the second category are replaced using a second replacement method different from the first replacement method, e.g., error mitigation or interpolation.

Claims

1. A method for transmitting data over a channel, comprising:

receiving data from a data source;

generating categorization data that categorizes the data into at least two categories based on a determination of a degradation associated with reconstructing the data, the categorization data assisting a receiver to reconstruct the data, wherein the categorization data includes categorizing the data into one of a first category and a second category; and

transmitting the data as a whole and the categorization data over the channel, wherein if at least a portion of the data is categorized into the first category, then error correction data is transmitted along with the data and the categorization data over the channel.

2. The method according to claim 1, wherein the error correction data includes forward error correction data that is used by a receiver to correct errors in the data that is categorized in the first category.

3. The method according to claim 2, wherein the receiver determines the category of the data based on the categorization data transmitted with the data.

4. The method according to claim 3, wherein the receiver performs forward error correction on the data of the first category to correct corrupt data.

5. The method according to claim 3, wherein the receiver performs error mitigation on the second category to correct corrupt data.

6. The method according to claim 1, wherein the determination of the degradation associated with reconstructing the data is determined by the perceived effect on an output signal of a receiver by an end user.

7. The method according to claim 1, wherein the determination of the degradation associated with reconstructing the data is determined by a perceptual entropy of the data to be replaced.

8. The method according to claim 1, wherein the determination of the degradation associated with reconstructing the data is determined by a prediction gain of the data to be replaced.

10. The method according to claim 1, wherein the determination of degradation associated with reconstructing the data is determined by a change in energy of a current frame compared to previous frames.

11. The method according to claim 1, wherein the determination of degradation is associated with reconstructing the data determined by a value of a temporal noise shaping parameter.

12. The method according to claim 1, wherein the determination of the degradation is associated with reconstructing the data determined by a value of a pre-echo control parameter.

13. The method according to claim 1, further comprising:

receiving the data and categorization data; and

determining whether the received data contains errors.

14. The method according to claim 13, wherein if the data contains errors and is categorized in the first category then correcting the errors in the data by perfonning forward error correction based on the error correction data transmitted with the data.

15. The method according to claim 13, wherein if the data contains errors and is categorized in the first category, then requesting a retransmission of the data from the transmitter.

16. The method according to claim 15, wherein the request for retransmission is transmitted across the channel.

17. The method according to claim 15, wherein the request for retransmission is transmitted on a second channel.

18. The method according to claim 15, wherein if the data contains errors after receiving the retransmission from the transmitter, then further correcting the data by performing error mitigation.

19. The method according to claim 15, wherein a determination of whether to request a retransmission of data is based on available channel capacity.

20. The method according to claim 1, further comprising:

transmitting a portion of the data based on at least one of the categorization of the data and an estimate of available bandwidth of the channel.

21. The method according to claim 20, wherein if the data is of a high priority, then the data is transmitted, and if the data is of a low priority, then the data is not transmitted.

9. The method according to clam 1, wherein the determination of the degradation is associated with reconstructing the data determined by the instantaneous bit rate required to encode the data.